Either way, you can't without a hacked console.
After, I think, system version 3.56 they disabled installation of update pups from usb devices.
Game update pkgs can only be installed if you have a modified firmware or QA flagged console.
Aye, but he didn't ask for instructions how to crack and add custom content for the PS3. He was simply asking if Sony and Bethesda has support for this, ie downloading PS3 patch via PC then apply the patch via USB.
He wanted this because he has a slow connection, not because he's trying to crack anything.